Question

What does 1.8e10 mean

Answer 1

For this case we have an expression of the form:
 $a * e (b)$
 We can rewrite this expression in scientific notation as:
 $a * 10 ^ b$
 Where,
 a: coefficient of scientific notation
 b: base ten exponent
 We then have the following expression:
 $1.8e10$
 Rewriting we have:
 $1.8 * 10 ^ {10}$
 Answer:
 $1.8e10 = 1.8 * 10 ^ {10}$

Answer 2

It means 1.8 × 10 to the tenth power. the E is a ten are you working with scientific notation